Reamer and boring-head.



PATENTED MAR. 1'7, 1908.

R. N. MELVIN. RBAMER AND BORING HEAD. AYPLIUKTION TILED DEG. 13,1906.

Illllll lllllfl 40 plain peripheral "may be employe if desired. Each cutter 7 clearance grinding on their 20 invention is embodied, in

" UNITED STATES ROY N. MELVIN,'OF EADVILLE, PENNSYLVANIA,

PATENT OFFICE.-

ASSIGNOR or ONE-HALF To W'INTERs n HAMAKER, OF MEADVILLE, PENNSYLVANIA.

BEAM-ER AND BORING-mean.

vill'e, in the county of Crawford'andstate of. flilfinnsylvania, have invented new and use Improvements in Reamers and Bo'ring Heads; of which the following is a specification. Mdyyinvention relates to reamers & boring hea. s and its. object is to provide a device of thisfclass particularly adapted for giving a shearing cut, for enabling the cutters to be- I readily adjusted, and

removedand replaced when worn, and designed-to provide means whereb the cutters ma be securely, although remove 1y locked in p ace, on the too to so "mount the cutters thatthey will cut at the most-effective angle, and will not require cutting edges and to provide acutterhaving a plurality of interchangeable cutting edges, To these ends my preferable form, in the device hereinafter described and illustrated in the accompanying drawings.

. In these drawings, Figure ,1 is aside view in-elevation showing one ofthe cutters re: moved; Fig. 2 is a top plan view; Fig. 3, a

clamping ring for the cutelevation showing one of the cutters in placeand the clamping ring in nut removed; Fig. 5, a central vertical section, and Fig. 6, a detail plan-and front view of one of the cutters.

Referring to the drawings, 1 is the shank of the tool adapted to besup'ported ina suit-- able operating device and 2 is the head in which the reaming cutters are carried. A

stem 3 extends beyond the head and is provided with a screwthread.ed portion 4 and a portion -5, In, the upper edge'of the head 2 are formed V-shaped recesses-or slots 6 adapted to receive the cutters 7. Four of these cutters are preferably provided althou 1 a greater or less number istnangular 1-11 form and so made that any one of its longitudinal edges may be ground down to a cutting edge and a cutter so placed in the slot 6 as to bring any one of these edges into cutting position.

In the device shown, 8 designates the cutting edge of the cutters when the tool is used as a reamer, while the forward longitudinal Specification of Letters Patent. Application filed December iaieos. Serial Nd. 347,057.

' provi since the clamping but with the lock of the stem is provi *proper position and of the or Patented March 1'7, 1908.

edge constitutes tool is used as aboring tool. The slot 6 is so out as to present one of its angle to the up or surface 9 of the hea than the other wa wh laterally triangular cutter is placed in the slot, the upper surface ofthe cutter will be tilted at an angle so as to raise the front or cutting edge higher than therear edge of the cutter, so as to obtain a shearing cut on the forward lo'n 'tudinal edge. f The cutters are placed loosey, in the slots and are then engaged by a c anipin'g ring 9 surrounding the plain (portion 5 of t e stem 3. This ring is ed with slanting cut-away or recessed portions 10 each terminating in a shoulder 11, which portions slant correspondingly to the angle of the outer plane faces of the tilted cutters and bear upon said faces so as to clampthecutters in der 11 abutagainstt e projected edges of thecutters and serve to hold the ring in .opler position with respectto-the cutters. it this form of clam ing ring, it is rendered possible to firmly 0 amp all the cutters, even where the edges of some of the. cutters may be grounddown more than .on others,

against the plane sur aces and not merely against the ed es of the cutters.

To securel hold the clamping ring in position and c ainp-it'a ainst the cutters, a lock-nut 12 engagin the threaded portion 4 ed and is adapted to be screwed down upon the clamping ringwhen the reamer is to be used.

To adjust the cutters in or out to fit holes of different sizes or in the event of the enlargement of thecutter socket through viration or otherwise'git is merely necessary to loosen the lock-nut, move the cutter to a ainlock the clampin' ring with the nut The shear cut obtame by the trian 'lar cutters mounted as shown, reduces the h iction so that a larger hole can be bored withthe same power as that gen orally re uired infreamers and boring-tools dinary construction. the recessed clamping collar which is so formed that it may be clamped against cutters having cutting edge, it is rendered unnecessar to grind the cutting edge to obtain the 0 carance. The clamping ring also couperates the cutting edge when the walls at a reaten:

ereby when the equi;

By the use of 5 difi'erentclearances on the lace, while the shouI-s ressure isbbtained with the tilted socket to enable the, cutter to be placedso as to present its cutting edge at an acute angle so as to obtain better results in cuttingi 4 Upon t e wearing down ting edges, the cutter may be chan of one of the cuted to present either of the other longitudina ed es i he tool can be made,1n all sizes to meet as a cutting edge by'merely din eit er of said edges and by propery off the outer end of the cutter to form the c earancje bevel 13. When the cutters become too worn tobe further used or are broken, they igfiy'be readily replaced by-new cutters, by

- ooking the nut and releasing the clampthe requirements of manufacturers .usmg boring mills, drill resses and turret machine and made wit either tapering shanks or 0t erwise to fit the adjustment of any machine.

' It isclear thatvariou's chan es in the par ticular construction ofthe a ove features may be made without'departingfrom the principle of my invention.

,Having'thus described my invention, what claim is:-

. a cutting tool, incombination with a removable cutter triangular in cross-section, a supporting 'head having a socket to receive the cutter substantially bodily, said walls at different angles to socket having its surface of the head, said the plane outer cutter having one of its plane faces projected angularly'q above said surface, a 'cla'mpmg ring, said ring having a slantingcut-away portion'on its inner face of substantially the same length as the rojected plane face of the cutter and adapte to bear on said face, and means to press said ring and cutters together, substantially as described.

' 2. In a cutting tool, in'combiuation with a removable cutter, a supporting head having a socket to receive the cutter, said cutter having a plane face rojected angularly beyond the socket, a c amping ring having a slanting cut-away portion substantiallybf the same length as the width of the cutter thereto, said cutter being supported in saidane faces prosocket and having one of its p 'ecte'd beyond the same, a clamping ring aving a slanting cut-away portion terminating in a shoulder, said slanting portion bearing' substantially throughout its length on the said 1projected plane'face of the cutter, and a 10.0 -nut to clampsaid-ring and cutters ltogether, substantially as described. In testimony whereof I affix mysignature,

in presence of two subscribing Witnesses. BOY N.. MELVIN.

Witnesses:

M. WEBSTER, OTTO A. STOLZ. 

